That's exactly what I thought it was too. So if that's what you were going for, then I think it looks REALLY good. The reason it still looks funny to you is probably just because that's not something that is seen very often.

If it is a boat, isn't it a good idea to draw a trail after the boat, like if it's moving? What will also be a nice addition to this scene may be some fishes, that suggests some more that the picture is actualy seen form under water, and not above.